Unlimited BombsIn the second level, destroy the fourth and fifth enemies that come on screen with the double blaster at the same time. The number of bombs you have stays the same, yet you're able to use as many as you please.

Unlock Floating headBeat the game with over 2000 points

Double Blaster PowerTo unlock the double blaster, you must leave three enemies alive during level three, no more, no less. This gives you the double blaster for the duration of the game, even if you lose a life.